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| Number | Title | Issue Date |
| 8082734 | Drive assembly for a reciprocating pump utilizing a linear actuator A drive assembly for a reciprocating pump includes a support structure with a linear actuator mounted on the support structure. The linear actuator has a stationary portion and a movable ram portion. At least one direction altering cable guide is mounted to the mova... | 12/27/2011 |
| 7765803 | Crankless reciprocating steam engine We present a high-efficiency crankless reciprocating steam engine that loses only a small amount of energy when the rectilinear motion of its piston is changed into the rotary motion of its driveshaft. The present invention continuously rotates a valve in one direct... | 08/03/2010 |
| 7208845 | Vibration based power generator A vibration based power generator. In a described embodiment, an electrical power generating system includes a vibrating assembly including a vortex shedding device which sheds vortices in response to fluid flow across the vibrating assembly. A generator generates e... | 04/24/2007 |
| 7199480 | Vibration based power generator A vibration based power generator. In a described embodiment, an electrical power generating system includes a vibrating assembly which vibrates in response to fluid flow across the vibrating assembly. A generator generates electrical power in response to displaceme... | 04/03/2007 |
| 7150330 | Hydraulic circuit and method for operating a gripping device A hydraulic circuit and method for operating a gripping mechanism according to which fluid is passed from a source to the device while some of the fluid is passed to a valve that is adjustable to control the amount of fluid passed to it and therefore the amount of f... | 12/19/2006 |
| 7107767 | Hydraulic energy storage systems A hydraulic energy storage system for vehicles to provide higher efficiency, smaller package size, lower weight, unitary construction, durability and enhanced reliability while maintaining the capability to efficiently store and restore energy at high power levels. | 09/19/2006 |
| 6978746 | Method and apparatus to control a variable valve control device The present invention provides an improvement over conventional engine control systems for variable valve control devices for the valvetrain in that it provides a substantially closed-circuit hydrostatic fluid control system and accompanying method to improve respon... | 12/27/2005 |
| 6948917 | Valving system for a downhole hydraulically actuated pump An engine for actuating a hydraulic downhole pump having a piston vertically reciprocated in a cylinder includes a reversing valve carried with the power piston and serving, when in a first position, to direct fluid flow to force the piston upwardly and in a second ... | 09/27/2005 |
| 6837166 | Rollercoaster launch system The invention is a launching system made of a gripping conus connected to a wire that is connected to a winch system, a turning sheave, and a lifting cylinder that is affixed to a base, wherein the winch system has a motor driven hydraulic pump connected to an accum... | 01/04/2005 |
| 6042342 | Fluid displacement system In a fluid displacement system having a pressure vessel, an expansion vessel, first and second tubes in fluid communication with the two vessels, and an energy source, fluid contained within the system is transferred from one vessel to the other by activa... | 03/28/2000 |
| 5548956 | Cable restrained reciprocating blade system for energy extraction from moving body of water A cable restrained reciprocating blade system is adapted for extracting energy from a moving body of water to facilitate conversion to electric energy. In an exemplary embodiment, the system includes a blade placed in a moving body of water and having a h... | 08/27/1996 |
| 5031402 | Pneumatic pump actuator for oil wells A wellhead mounted pneumatic actuator for bottom hole oil pumps designed for operation by compressed air or gas. The preferred embodiment utilizes a single action cylinder with the downstroke actuated by the weight of the sucker rods and the fluid contain... | 07/16/1991 |
| 5018350 | Long stroke deep well pumping unit A long stroke deep well pumping unit which employs a fluid motor connected with a polish rod by using a plurality of belts, fixed at either end, to reciprocate the sucker rod through repeated long strokes with a minimum of stress and shock to the sucker r... | 05/28/1991 |
| 5012643 | Pressure-driven engine A pressure-driven engine is provided therein with an intake valve and an exhaust valve the opening and closing operations of which are controlled by a combination of the urging force of the respective springs and the attractive force of the respective mag... | 05/07/1991 |
| 4886149 | Rotary type hydraulic damper A rotary type hydraulic damper for motorcycle suspension application is disclosed in which a shaft and a housing each containing oppositely extending vanes are arranged for relative rotational movement. The vanes cooperate to define alternately spaced exp... | 12/12/1989 |
| 4790728 | Dual-rigid-hollow-stem actuators in opposite-phase slurry pump drive having variable pumping speed and force A slurry pump has slurry hopper and dual pumping cylinders. The slurry pumping members are driven by opposite-phase actuators. Each actuator has a rigid-hollow-stem partition dividing the space between the actuator plunger and the cylinder into two drive ... | 12/13/1988 |
| 4712374 | Hydraulic pump jack A hydraulic pump jack is disclosed which utilizes a hydraulic cylinder to provide pumping force to an oil well sucker rod. The hydraulic pump jack may be directly mounted on an oil well casing either above or below ground. A tubular piston rod which may b... | 12/15/1987 |
| 4680930 | Hydraulic control circuit and valve assembly A hydraulic power and control system for operating a reciprocating hydraulic mechanism including pump means connected to the hydraulic mechanism, a continuous torque hydraulic motor, a direction control driven by the motor to sequentially direct hydraulic... | 07/21/1987 |
| 4646517 | Hydraulic well pumping apparatus For use with a pumped well having a string of sucker rods connecting to a downhole pump, hydraulic pumping apparatus is disclosed. In the preferred and illustrated embodiment, a polished rod is surrounded by a selectively located sleeve. The sleeve locks ... | 03/03/1987 |
| 4534168 | Pump jack A pump jack having a walking beam oscillated in a vertical arc by a hydraulic actuating cylinder that receives pressurized hydraulic fluid from a variable displacement pump. The hydraulic actuating cylinder is controlled by a hydraulic valve having an ope... | 08/13/1985 |
| 4503752 | Hydraulic pumping unit A hydraulic pumping unit is provided that is especially adapted for use for pumping oil from a well, and that provides for independent upstroke and downstroke speed control of the well sucker rod. The pumping unit includes a load sensing, pressure and flo... | 03/12/1985 |
| 4497616 | Hydraulically-operated pump jack with chain drive My invention relates to pumping apparatus, particularly to a hydraulically-operated pump jack for oil, brine water and the like. The apparatus is fabricated from steel plate to make a strong, but light-weight tower which may be easily transported from one... | 02/05/1985 |
| 4474002 | Hydraulic drive pump apparatus A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkag... | 10/02/1984 |
| 4467603 | Torque transfer apparatus A torque transfer apparatus includes one or more externally powered energy pumps having a plurality of piston and follower arrangements. The pistons are attached to crankshafts, while the associated followers are controlled by a timing chain driven camsha... | 08/28/1984 |
| 4457678 | Fluid drive mechanism A mechanism for moving an element in opposite directions includes a piston connected with the element. The piston reciprocates in a cylinder as high pressure fluid is alternately directed against one side or the other of the piston by a rotatable directio... | 07/03/1984 |
| 4449896 | Hydraulic operated surface pumping unit The hydraulic operated surface pumping unit of this invention is a counterbalanced cross beam type pumping unit driven by a hydraulic cylinder. The pumping unit can be operated in a first mode of equal upstroke and down stroke speeds or in a second mode o... | 05/22/1984 |
| 4430924 | Petroleum pumping unit A petroleum pumping unit which is especially suitable for use in remote oil fields and under unpredictable pumping conditions is disclosed. The petroleum pumping unit of the present invention, which is easily movable between a folded, collapsed position f... | 02/14/1984 |
| 4406122 | Hydraulic oil well pumping apparatus The preferred embodiment is directed to an oil well pumping apparatus incorporating a walking beam having a horsehead at one end which connects to the sucker rods in the oil well. The opposite end of the walking beam is supported on a fixed pivot. A hydra... | 09/27/1983 |
| 4381695 | Hydraulically operated pump jack with holding valves and control assembly A hydraulically operated pump jack utilizing dual hydraulically operated piston and cylinder assemblies for pivoting the beam of the pump jack and including a unique control arrangement associated with a reversing valve for controlling operation of the pi... | 05/03/1983 |
| 4346620 | Shock absorbing means for a rocker arm type oil well pump Apparatus for pumping oil from a well includes a hydraulic pump for reciprocating a sucker rod string. A counterweight is connected to the sucker rod string by a chain strung over sprockets within a compact framework. The hydraulic pump applies a shock ab... | 08/31/1982 |
| 4249376 | Pump jacks A pump jack for pumping oil and like wells having a polish rod extending vertically out of a well casing is provided including a frame adapted to fit over said well, a hydraulic cylinder depending from said frame generally coaxially of said polish rod, a ... | 02/10/1981 |
| 4213298 | Self-reversing hydraulic control system and self-reversing pump incorporating such system A self-reversing hydraulic control system for use with a device to be driven in opposite directional modes, especially a self-reversing pump driven by such a device. The system depends upon a flow sensing element disposed to sense flow associated with mov... | 07/22/1980 |
| 4212228 | Power plant A high torque hydraulic power plant is operated by electrical power through the use of a hydraulic pump, opposing double-ended cylinders containing double-ended pistons and appropriate cycling valve means. Pressure is maintained in the system by a constan... | 07/15/1980 |
| 4210063 | Fluid power device A fluid actuated power device which includes a reciprocal cylinder rotatably mounted on a central, tubular shaft for back-and-forth movement along the shaft between a pair of end support members. The cylinder has first and second sets of spiral grooves on... | 07/01/1980 |
| 4201115 | Oil well pump jack with dual hydraulic operating cylinders An oil well pump jack with dual hydraulically operated piston and cylinder assemblies for pivoting the walking beam of the pump jack and including a unique control arrangement for controlling operation of the piston and cylinder assemblies. The pump jack ... | 05/06/1980 |
| 4198820 | Pumping unit for a well pump A pumping unit for a well pump has a surface main cylinder with a main piston reciprocable therein, the piston having a connection to a standard well pump. In a flow cylinder of a relatively large diameter, a flow piston reciprocates within and divides th... | 04/22/1980 |
| 4188786 | Hydraulic machine The hydraulic machine comprises an oscillating rotor, mounted on a machine frame, which is driven with reciprocating movement by a crank mechanism. On the oscillating rotor there is arranged an active pipe circuit filled with water, and consisting of a pi... | 02/19/1980 |
| 4187680 | Oil well pump drive An oil well pump drive including a drive unit that is hydraulically actuated by a double-acting hydraulic cylinder to reciprocate vertically. An endless chain is entrained over vertically spaced sprockets carried by the unit, with one flight of the chain ... | 02/12/1980 |
| 4184409 | Hydraulic engine A hydraulic engine having a fluid pump for pumping a fluid medium under pressure to a fluid motor connected to the pump for being actuated by the fluid medium under pressure received from the pump. A control system regulates operation of the pump and moto... | 01/22/1980 |
| 4176520 | Drive system for deep well pump A drive system is provided for driving the pump rod of a deep well pump. The drive system includes a lift cylinder having a piston movable therein connected to the pump rod of the well pump. The lift cylinder piston is driven by fluid pressure provided fr... | 12/04/1979 |
